The Dicke effect diminishes the broadening of spectral lines owing to this 
The Dicke effect diminishes the broadening of spectral lines owing to this effect. The form of this effect that occurs at the point of closest approach is called "transverse"; that effect was employed in a confirmation of a certain relationship conducted by Ives and Stillwell and is one of the novel predictions of (*) special relativity. One form of this effect has a namesake factor equal to the square root of quantity one plus beta over one minus beta. This effect is summarized by a factor of velocity plus receiver velocity over velocity plus source velocity. For 10 points, name this effect, wherein the frequency of a wave is changed by the relative motion of an observer.
The Dicke effect diminishes the broadening of spectral lines owing to this effect.
{Doppler} effect